diff --git a/iam/api-client/access_test.py b/iam/api-client/access_test.py
index 838468467879..7df4d8a113ad 100644
--- a/iam/api-client/access_test.py
+++ b/iam/api-client/access_test.py
@@ -13,15 +13,16 @@
 # limitations under the License.
 
 import os
-import pytest
 import uuid
 
 from googleapiclient import errors
+import pytest
 from retrying import retry
 
 import access
 import service_accounts
 
+
 # Setting up variables for testing
 GCLOUD_PROJECT = os.environ["GCLOUD_PROJECT"]
 
diff --git a/iam/api-client/custom_roles_test.py b/iam/api-client/custom_roles_test.py
index 192141104767..5d2252235434 100644
--- a/iam/api-client/custom_roles_test.py
+++ b/iam/api-client/custom_roles_test.py
@@ -13,11 +13,13 @@
 # limitations under the License.
 
 import os
-import pytest
 import uuid
 
-import custom_roles
 import googleapiclient.errors
+import pytest
+
+import custom_roles
+
 
 GCLOUD_PROJECT = os.environ["GCLOUD_PROJECT"]
 
diff --git a/iot/api-client/codelabs/gateway.py b/iot/api-client/codelabs/gateway.py
index c5bc291a3602..0fd5e3cac0aa 100644
--- a/iot/api-client/codelabs/gateway.py
+++ b/iot/api-client/codelabs/gateway.py
@@ -143,7 +143,7 @@ def on_publish(unused_client, userdata, mid):
 
 
 def on_subscribe(unused_client, unused_userdata, mid, granted_qos):
-    print('on_subscribe: mid {}, qos {granted_qos}'.format(mid))
+    print('on_subscribe: mid {}, qos {}'.format(mid, granted_qos))
     try:
         client_addr, response = gateway_state.pending_subscribes[mid]
         udpSerSock.sendto(response.encode(), client_addr)
diff --git a/iot/api-client/end_to_end_example/cloudiot_pubsub_example_server.py b/iot/api-client/end_to_end_example/cloudiot_pubsub_example_server.py
index c04a2b9e1af8..f76033d3918e 100644
--- a/iot/api-client/end_to_end_example/cloudiot_pubsub_example_server.py
+++ b/iot/api-client/end_to_end_example/cloudiot_pubsub_example_server.py
@@ -43,9 +43,9 @@
 import time
 
 from google.cloud import pubsub
+from google.oauth2 import service_account
 from googleapiclient import discovery
 from googleapiclient.errors import HttpError
-from google.oauth2 import service_account
 
 
 API_SCOPES = ['https://www.googleapis.com/auth/cloud-platform']
diff --git a/iot/api-client/gcs_file_to_device/gcs_send_to_device_test.py b/iot/api-client/gcs_file_to_device/gcs_send_to_device_test.py
index a347465d13a0..c3309e89f7dc 100644
--- a/iot/api-client/gcs_file_to_device/gcs_send_to_device_test.py
+++ b/iot/api-client/gcs_file_to_device/gcs_send_to_device_test.py
@@ -19,17 +19,17 @@
 
 from google.cloud import pubsub
 from google.cloud import storage
-
-# Add manager for bootstrapping device registry / device for testing
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager'))  # noqa
-import manager
-
 import mock
 import pytest
 import requests
 
 import gcs_send_to_device as gcs_to_device
 
+# Add manager for bootstrapping device registry / device for testing
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager'))  # noqa
+import manager  # noqa
+
+
 gcs_bucket = os.environ['CLOUD_STORAGE_BUCKET']
 project_id = os.environ['GCLOUD_PROJECT']
 service_account_json = os.environ['GOOGLE_APPLICATION_CREDENTIALS']
diff --git a/iot/api-client/http_example/cloudiot_http_example_test.py b/iot/api-client/http_example/cloudiot_http_example_test.py
index 0ab22e3edfde..8497d1ffb334 100644
--- a/iot/api-client/http_example/cloudiot_http_example_test.py
+++ b/iot/api-client/http_example/cloudiot_http_example_test.py
@@ -16,15 +16,14 @@
 import time
 
 from google.cloud import pubsub
-
-# Add manager for bootstrapping device registry / device for testing
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager'))  # noqa
-import manager
-
 import pytest
 
 import cloudiot_http_example
 
+# Add manager for bootstrapping device registry / device for testing
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager'))  # noqa
+import manager  # noqa
+
 
 cloud_region = 'us-central1'
 device_id_template = 'test-device-{}'
diff --git a/iot/api-client/manager/manager_test.py b/iot/api-client/manager/manager_test.py
index 175f04753a94..20bac093a5f2 100644
--- a/iot/api-client/manager/manager_test.py
+++ b/iot/api-client/manager/manager_test.py
@@ -18,13 +18,14 @@
 import time
 import uuid
 
-# Add command receiver for bootstrapping device registry / device for testing
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'mqtt_example'))  # noqa
 from google.cloud import pubsub
 import pytest
 
-import manager
-import cloudiot_mqtt_example
+# Add command receiver for bootstrapping device registry / device for testing
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'mqtt_example'))  # noqa
+import cloudiot_mqtt_example  # noqa
+import manager  # noqa
+
 
 cloud_region = 'us-central1'
 device_id_template = 'test-device-{}'
diff --git a/iot/api-client/mqtt_example/cloudiot_mqtt_example_test.py b/iot/api-client/mqtt_example/cloudiot_mqtt_example_test.py
index 50b6accd4134..0fd06f7d9427 100644
--- a/iot/api-client/mqtt_example/cloudiot_mqtt_example_test.py
+++ b/iot/api-client/mqtt_example/cloudiot_mqtt_example_test.py
@@ -18,14 +18,15 @@
 
 import pytest
 
-# Add manager for bootstrapping device registry / device for testing
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager')) # noqa
-import cloudiot_mqtt_example
-import manager
 from fixtures import test_topic # noqa
 from fixtures import test_registry_id # noqa
 from fixtures import test_device_id # noqa
 from fixtures import device_and_gateways # noqa
+# Add manager for bootstrapping device registry / device for testing
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager')) # noqa
+import cloudiot_mqtt_example  # noqa
+import manager  # noqa
+
 
 cloud_region = 'us-central1'
 ca_cert_path = 'resources/roots.pem'
diff --git a/iot/api-client/mqtt_example/cloudiot_mqtt_image.py b/iot/api-client/mqtt_example/cloudiot_mqtt_image.py
index 60d7ded3e255..210b17deef2e 100644
--- a/iot/api-client/mqtt_example/cloudiot_mqtt_image.py
+++ b/iot/api-client/mqtt_example/cloudiot_mqtt_image.py
@@ -25,7 +25,7 @@
 
 # Add manager as library
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager'))  # noqa
-import cloudiot_mqtt_example
+import cloudiot_mqtt_example  # noqa
 
 
 # [START iot_mqtt_image]
diff --git a/iot/api-client/mqtt_example/cloudiot_mqtt_image_test.py b/iot/api-client/mqtt_example/cloudiot_mqtt_image_test.py
index 2a41857982ff..5ee457c51391 100644
--- a/iot/api-client/mqtt_example/cloudiot_mqtt_image_test.py
+++ b/iot/api-client/mqtt_example/cloudiot_mqtt_image_test.py
@@ -16,13 +16,13 @@
 import sys
 
 # Add manager as library
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager')) # noqa
-import cloudiot_mqtt_image
-import manager
-from fixtures import test_topic # noqa
-from fixtures import test_subscription # noqa
-from fixtures import test_registry_id # noqa
-from fixtures import test_device_id # noqa
+sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager'))  # noqa
+import cloudiot_mqtt_image  # noqa
+import manager  # noqa
+from fixtures import test_topic  # noqa
+from fixtures import test_subscription  # noqa
+from fixtures import test_registry_id  # noqa
+from fixtures import test_device_id  # noqa
 
 
 cloud_region = 'us-central1'
diff --git a/iot/api-client/mqtt_example/fixtures.py b/iot/api-client/mqtt_example/fixtures.py
index 4fc7be9aa7e2..d78f72001c22 100644
--- a/iot/api-client/mqtt_example/fixtures.py
+++ b/iot/api-client/mqtt_example/fixtures.py
@@ -18,15 +18,15 @@
 import uuid
 
 import backoff
-from googleapiclient.errors import HttpError
-from google.cloud import pubsub
 from google.api_core.exceptions import AlreadyExists
 from google.api_core.exceptions import NotFound
+from google.cloud import pubsub
+from googleapiclient.errors import HttpError
 import pytest
 
 # Add manager as library
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager')) # noqa
-import manager
+import manager  # noqa
 
 
 cloud_region = 'us-central1'
diff --git a/iot/api-client/mqtt_example/gateway_demo.py b/iot/api-client/mqtt_example/gateway_demo.py
index 8e2bbd44d15c..61c4311e3ebd 100644
--- a/iot/api-client/mqtt_example/gateway_demo.py
+++ b/iot/api-client/mqtt_example/gateway_demo.py
@@ -21,9 +21,9 @@
 import time
 
 sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'manager'))  # noqa
+import cloudiot_mqtt_example  # noqa
+import manager  # noqa
 
-import cloudiot_mqtt_example
-import manager
 
 logging.getLogger('googleapiclient.discovery_cache').setLevel(logging.CRITICAL)